Galactica

Galactica is an Autobot from the Generation 1 series.

Galactica was one of the many casualties of the war for Cybertron before the launch of the Ark. It is possible that due to the name ending in "a", that Galactica is a female Transformer, but since nothing more than a name is known about this individual, it is conjecture at best.

Fiction

Dreamwave Generation 1 Comics

The Decepticons Frenzy and Rumble mention Galactica as one of the various Autobot casualties while enjoying some downtime, getting to the "G"s in tallying up the known dead.

From Teletraan I: The Transformers Wiki, a Wikia wiki.